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11. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2922NA Klamath Project - Oregon-California. View of trenching machine. Hopper unit and digging chain have been lifted out of ground; November 1972; Bureau of Reclamation photo by D. W. Stein...Citation -
12. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
CN-12-201-218NA Klamath Project - Oregon-California. View of trenching equipment in operation; November 1972; Bureau of Reclamation photo by D. W. SteinCitation -
13. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
CN-12-201-291NA Klamath Project - Oregon-California. Experimental Line in Unit 71. View of fiberglass membrane covered tubing being fed into hopper unit behind trenching machine. Installation methods were ...Citation -
14. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
CN-12-201-292NA Klamath Project - Oregon-California. Experimental Line in Unit 71. View of pipe being fed into hopper unit pulled behind trenching machine. No cinder envelope was placed around this type ...Citation -
P-12-200-2964NA Klamath Project - Oregon-California. View of spillway, looking west. The backhoe is excavating the cut-off trench at the downstream toe of the spillway; April 1974; Bureau of Reclamation ...
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CN-12-200-64A Klamath Project - Oregon-California. Looking west at equipment developed and used by Contractor to excavate and install plastic drainage tubing in one operation. Note that the trencher tows ...
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